FLATNESS_PENALTY  879 third_party/libwebp/enc/quant.c       rd16.R += FLATNESS_PENALTY * kNumBlocks;
FLATNESS_PENALTY  962 third_party/libwebp/enc/quant.c         rd_tmp.R += FLATNESS_PENALTY * kNumBlocks;
FLATNESS_PENALTY 1025 third_party/libwebp/enc/quant.c       rd_uv.R += FLATNESS_PENALTY * kNumBlocks;